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Lamont Research Professor
Lamont-Doherty Earth Observatory
Seismology Geology and Tectonophysics
Earth and Environmental Sciences
Associate Director - Seismology, Geology and Tectonophysics
Lamont-Doherty Earth Observatory
108G Seismology
61 Route 9W - PO Box 1000
(845) 365-8450
(845) 365-8150


Fields of interest: 
Earthquake Seismology, Geodynamics

The surface of the Earth is constantly deforming, over time scales ranging from seconds to eons, and spatial scales ranging from centimeters to thousands of kilometers. This deformation fundamentally impacts human life by generating natural hazards such as earthquakes and volcanoes, as well as by modulating our natural environment and climate. The underlying cause of this deformation is convection in the Earths mantle, the large-scale circulation pattern where hot material is constantly cycled to the surface, where it cools and then sinks. In my research, I utilize seismic images of the Earths deep interior to gain a better understanding of mantle convection and its effect on Earths surface. This effort often requires collecting new seismic data in field locations ranging from the mountain peaks of far northwestern Canada, to the newly formed seafloor in the Gulf of California.

List of degrees from highest to lowest:
Ph.D. Geophysics
Massachusetts Institute of Technology
M.S. Geology
University of Michigan
B.S. Geophysics
Brown University
Honors & Awards: 
Sigma Xi Young Faculty Award, Georgia Institute of Technology 2002

Lamont Projects:

Research Blogs:

Referenced in the Following News Items:

Featured in the Following Videos:

Selected Publications:

Seismic velocity structure and depth-dependence of anisotropy in the Red Sea and Arabian shield from surface wave analysis Hansen, S. E.; Gaherty, J. B.; Schwartz, S. Y.; Rodgers, A. J.; Al-Amri, A. M. S. Journal of Geophysical Research-Solid Earth Oct 14 Volume: 113 Issue: B10 p.: - (2008) Doi 10.1029/2007jb005335
The teleseismic signature of fossil subduction: Northwestern Canada Mercier, J. P.; Bostock, M. G.; Audet, P.; Gaherty, J. B.; Garnero, E. J.; Revenaugh, J. Journal of Geophysical Research-Solid Earth Apr 29 Volume: 113 Issue: B4 p.: - (2008) Doi 10.1029/2007jb005127
Evaluating hot spot-ridge interaction in the Atlantic from regional-scale seismic observations Gaherty, J. B.; Dunn, R. A. Geochemistry Geophysics Geosystems May 11 Volume: 8 p.: - (2007) Doi 10.1029/2006gc001533
Surface wave tomography of the upper mantle beneath the Reykjanes Ridge with implications for ridge-hot spot interaction Delorey, A. A.; Dunn, R. A.; Gaherty, J. B. Journal of Geophysical Research-Solid Earth Aug 24 Volume: 112 Issue: B8 p.: - (2007) Doi 10.1029/2006jb004785
Upper mantle structure beneath the eastern Pacific Ocean ridges Gu, Y. J.; Webb, S. C.; Lerner-Lam, A.; Gaherty, J. B. Journal of Geophysical Research-Solid Earth Jun 11 Volume: 110 Issue: B6 p.: - (2005) Doi 10.1029/2004jb003381
Mantle defomation during slow seafloor spreading constrained bv observations of seismic anisotropy in the western Atlantic Gaherty, J. B.; Lizarralde, D.; Collins, J. A.; Hirth, G.; Kim, S. Earth and Planetary Science Letters Dec 15 Volume: 228 Issue: 3-4 p.: 255-265 (2004) DOI 10.1016/j.epsl.2004.10.026
Spreading-rate dependence of melt extraction at mid-ocean ridges from mantle seismic refraction data Lizarralde, D.; Gaherty, J. B.; Collins, J. A.; Hirth, G.; Kim, S. D. Nature Dec 9 Volume: 432 Issue: 7018 p.: 744-747 (2004) Doi 10.1038/Nature03140
A surface wave analysis of seismic anisotropy beneath eastern North America Gaherty, J. B. Geophysical Journal International Sep Volume: 158 Issue: 3 p.: 1053-1066 (2004) DOI 10.1111/j.1365-246X.2004.02371.x
Structure of the Kaapvaal craton from surface waves Freybourger, M.; Gaherty, J. B.; Jordan, T. H.; Grp, Kaapvaal Seismic Geophysical Research Letters Jul 1 Volume: 28 Issue: 13 p.: 2489-2492 (2001)
Seismic evidence for hotspot-induced buoyant flow beneath the Reykjanes Ridge Gaherty, J. B. Science Aug 31 Volume: 293 Issue: 5535 p.: 1645-1647 (2001)